The sink may not be dirty. The surface might be worn and scratched. I had this problem in my old house and after I cleaned the sink and dried it, I waxed it with Johnson's paste wax. It has to be done often but you have to clean the sink often so it doesn't matter.

06/23/2010

The thing that works on my beige fiberglass shower is Dawn dishwashing liquid and a scrub brush. I don't see why it wouldn't also work for black fiberglass.

If it needs a good cleaning only I'd try Bar Keeper's friend. It works on fiberglass and a host of other surfaces. I have used it on my glass top stove and on a stainless steel sink, the results are great! You can usually find Bar Keeper's friend near the other abrasive cleaning products like Comet and Ajax.

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